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CVE Record

CVE-2021-1234: Cisco SD-WAN vManage Information Disclosure Vulnerabilities

A vulnerability in the cluster management interface of Cisco SD-WAN vManage Software could allow an unauthenticated, remote attacker to view sensitive information on an affected system. To be affected by this vulnerability, the vManage software must be in cluster mode. This vulnerability is due to the absence of authentication for sensitive information in the cluster management interface. An attacker could exploit this vulnerability by sending a crafted request to the cluster management interface of an affected system. A successful exploit could allow the attacker to view sensitive information on the affected system.Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.

MediumCVSS 5.3Not KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

This vulnerability lets an unauthenticated remote attacker view sensitive information from Cisco SD-WAN vManage systems when they run in cluster mode. Cisco says software updates are available and there are no workarounds. The business risk is information exposure, not system takeover based on the provided sources.

Executive priority

Treat as a moderate-priority remediation item. Patch clustered Cisco SD-WAN management systems promptly, especially where management interfaces are broadly reachable, because exposed management data can support follow-on attacks.

Technical view

CVE-2021-1234 is a CWE-497 information disclosure flaw in the Cisco SD-WAN vManage cluster management interface. Missing authentication for sensitive information allows crafted remote requests to expose data. CVSS 3.1 is 5.3, with low confidentiality impact and no stated integrity or availability impact.

Likely exposure

Exposure is limited to affected Cisco SD-WAN vManage or Cisco Catalyst SD-WAN Manager versions operating in cluster mode. Systems not in cluster mode are not described as affected. Risk depends on whether attackers can reach the cluster management interface.

Exploitation context

The provided bundle does not show CISA KEV listing or active exploitation evidence. Cisco describes remote unauthenticated exploitation as possible through crafted requests, but no public exploit status is confirmed in the supplied sources.

Researcher notes

Evidence is strongest for affected condition, vulnerability class, CVSS, and vendor remediation status. The bundle does not include fixed-version mapping, exploit telemetry, or detailed data types exposed, so avoid overstating impact beyond sensitive information disclosure.

Mitigation direction

  • Apply Cisco software updates that address this vulnerability.
  • Use Cisco’s advisory to identify the correct fixed release path.
  • Prioritize clustered vManage deployments for remediation.
  • Do not rely on workarounds; Cisco states none address this issue.

Validation and detection

  • Inventory Cisco SD-WAN Manager and vManage versions.
  • Confirm whether each deployment runs in cluster mode.
  • Check whether the cluster management interface is reachable from untrusted networks.
  • Verify upgraded systems no longer run listed affected versions.
  • Document remaining exceptions and planned update dates.
Prepared
Confidence
high
Sources
3

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

cwe · low confidence lookup

CWE-497: Exact CWE lookup

Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.

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cve · low confidence lookup

CVE-2021-1234 mapping review

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Vulnerability profileCVE Program record
Severity
Medium
CVSS
5.3 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

1CVSS vectors
0Timeline events
0ADP providers
2Source links

CVSS vector scores

1 official score

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
5.3CVSS 3.1MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N3.91.4Primary CVE score

Vulnerability scoring details

Base CVSS 3.1 score

5.3Medium
CVSS 3.1 vector shape for CVE-2021-1234Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
CiscoCisco Catalyst SD-WAN Manager20.1.12, 19.2.1, 18.4.4, 18.4.5, 20.1.1.1, 20.1.1, 19.3.0, 19.2.2, 19.2.099, 18.3.6, 18.3.7, 19.2.0, 18.3.8, 19.0.0, 19.1.0, 18.4.302, 18.4.303, 19.2.097, 19.2.098, 17.2.10, 18.3.6.1, 19.0.1a, 18.2.0, 18.4.3, 18.4.1, 17.2.8, 18.3.3.1, 18.4.0, 18.3.1, 17.2.6, 17.2.9, 18.3.4, 17.2.5, 18.3.1.1, 18.3.5, 18.4.0.1, 18.3.3, 17.2.7, 17.2.4, 18.3.0, 19.2.3, 18.4.501_ES, 20.1.2, 19.2.929, 19.2.31, 19.2.32, 18.4.6, 20.1.2_937unknown
Weakness

CWE details

CWE-497

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.

CWE-497 · source CWE mapping

Exposure of Sensitive System Information to an Unauthorized Control Sphere

Exposure of Sensitive System Information to an Unauthorized Control Sphere represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

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